OSSIOC_SZ
#define __OSSIOR(x, y, t) ((int)(OSSIOC_OUT|OSSIOC_SZ(t)|(x<<8)|y))
#define __OSSIOW(x, y, t) ((int)(OSSIOC_IN|OSSIOC_SZ(t)|(x<<8)|y))
#define __OSSIOWR(x, y, t) ((int)(OSSIOC_INOUT|OSSIOC_SZ(t)|(x<<8)|y))